Typical Size : 3/8" x 3/8" x 3" (or 9.52x9.52x76.2MM) & 3/8" x 3/8" x 4" (or 9.52x9.52x101.6MM)

Ferrocerium rod is made from Iron, Magnesium and mostly of an alloy of rare earth metals called mischmetal with an excellent pyrophoric percentage :  98%min.

The required chemical composition:   
Mischmetal(rare earth metal)  76%MIN.
Fe (Ferro or Iron)     18 ~ 21%
Mg ( Magnesium )    1.5 ~ 2.5%
Hardness :               90 ~ 170 HB

Surface   : black lacquer coated, natural grey, colored 

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